孤岛运行模式下的低压微电网控制策略

Control strategy of low voltage micro-grid in island mode

根据分布式电源的分散性、间歇性等特点以及用电负荷的不同等级,需采用多种分布式电源之间的协同控制策略保障孤岛运行模式下的微电网安全稳定运行。本文采用了主从控制方式对多微源低压微电网进行控制,以提高微电网的供电可靠性。微电网孤岛运行下,源荷平衡策略首先保证重要负荷不断电运行;其次,在微源状态允许的情况下,尽量保证负荷少停电。使用Matlab建立仿真模型,通过对孤岛模式下投切负荷等情况进行仿真分析,验证了低压孤岛微电网下所设计控制策略的可靠性及有效性。

According to the decentralization and intermittent characteristics of distributed generation, as well asdifferent levels of load, the collaborative control strategy is developed between various distributed generations to protect the micro-grid, which is operating in island mode, safe and stable. In this article, in order to improve the reliability of the micro-grid, the master-slave control is adopted to control the micro-grid. When micro-grid is operating in island mode, the source-load balancing strategy ensures that the important load is uninterrupted running; secondly, the source-load balancing strategy will ensure less power outage as far as possible if micro-source can make it. The simulation model is established by using Matlab. Simulation analysis of switching load is carried out in the micro-grid model running in island mode, therefore, it proves that the control strategy under low voltage micro-grid in island mode is reliable and effective.